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12/08/2006 09:51:25 AM · #26 |
Originally posted by kirbic:
The practical side, in a nutshell:
- Take several exposures
- Open the first in PS
- Open the second, place on a layer above the first, and set the opacity to 50%
- Tweak the registration so it is aligned with the first image
- Repeat this process with subsequent images, turning visibility off for all but the first and current images.
- Now everything is aligned. Turn all the layers back on, and set layer opacity as follows (Layer 1 is at bottom:
Layer 1, 100% (1/1)
Layer 2, 50% (1/2)
Layer 3, 33% (1/3)
Layer 4: 25% (1/4)
And so on. For each four images stacked, random noise is reduced to 50% of its original value. |
Could you elaborate on how to "Tweak the registration"? This is something I have not tried yet. Also, if your original photos have a lot of noise in them, I am assuming you do NOT use any form of noise reduction on them before stacking, or should you???
Thanks! |
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12/08/2006 11:06:43 AM · #27 |
Originally posted by BakerBug:
Could you elaborate on how to "Tweak the registration"? This is something I have not tried yet. Also, if your original photos have a lot of noise in them, I am assuming you do NOT use any form of noise reduction on them before stacking, or should you???
Thanks! |
I'll assume we're talking about a night sky, with some stars. You want the stars to line up. But the stars move in the frame. So you keep the exposure short enough to minimize any trailing (<30s or so for a 16mm lens on an APS-C camera) and when you stack them up, you need to nudge one layer one direction or another, and sometimes (most times) rotate slightly to make sure all the stars are aligned. There are software packages that do this automatically. You can do it in PS by selecting the "move" tool and using the arrow keys to align. That's the reason for setting opacity to 50%, so you can see the alignment.
Remember that if you include part of the landscape, that will *not* move, and so you will need to process the sky separately. It can be quite a job, especially when the land/sky interface is complicated.
All in all, this is a rather involved technique, requiring knowledge and skill. Don't be put off though. Go out and experiment. The results can be very well worth it. |
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12/08/2006 12:32:07 PM · #28 |
i'm going to try. sometimes, i shy away from new things so my score won't suffer, but this site is to learn. we shall see :) don't be scared, do research...that's what this site's about. good luck everyone. i hope to see a lot of entries into this. should be an extremely interesting challenge.
Jon Rowe |
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12/08/2006 03:14:12 PM · #29 |
As literal as this crowd is, I wonder if what I've been working on for the last 3 hours will suit them. It's 3 images melded together with layers, filters, etc. I love it but do you think stars and clouds are all people want???
Message edited by author 2006-12-08 15:14:36. |
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12/08/2006 03:21:20 PM · #30 |
Originally posted by Jutilda:
As literal as this crowd is, I wonder if what I've been working on for the last 3 hours will suit them. It's 3 images melded together with layers, filters, etc. I love it but do you think stars and clouds are all people want??? |
I dont think so... When I first read the challenge I tought about a cloud-less day... Didnt think of clouds-stars-moons until I read this thread...And actually I would love to see something more "original" being an experts challenge...
edit to ad... &%/& I just had a great idea and mexican sky will not help me with it... :( I think I`ll have to pass on this...*cry*
Message edited by author 2006-12-08 15:27:23. |
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12/08/2006 03:38:12 PM · #31 |
| Well if Gaby's not in I'm not in :( |
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12/08/2006 04:06:03 PM · #32 |
Originally posted by alfresco:
Well if Gaby's not in I'm not in :( |
You may not believe it, but I readed your post, turn to see the sky and it was open! not very photogenicly open, but I may give it a shot.. I can do a composite after all! :D |
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12/13/2006 10:27:46 PM · #33 |
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12/14/2006 10:28:20 AM · #34 |
oh yeah, I'm gonna kick butt and take names :-)
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12/14/2006 10:32:24 AM · #35 |
Originally posted by fotomann_forever:
oh yeah, I'm gonna kick butt and take names :-) |
I'm gonna lick butt and take names. (I can't believe I just typed that.)
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12/14/2006 10:43:33 AM · #36 |
| i see the sky for 10 days didn't now ... the fog has come, and never leave it will i think. [yoda] |
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12/14/2006 10:48:13 AM · #37 |
I have had my image submitted since Saturday. I have no clue which way it will go with votes but I am gonna guess a ton of comments and maybe 5 faves in challenge. Man am I looking forward to seeing what shows up in the entries for this one.
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12/14/2006 10:48:46 AM · #38 |
Originally posted by Strikeslip:
Originally posted by fotomann_forever:
oh yeah, I'm gonna kick butt and take names :-) |
I'm gonna lick butt and take names. (I can't believe I just typed that.) |
And let me just say that this just gave me some serious shivers.
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12/14/2006 10:54:30 AM · #39 |
Originally posted by timfythetoo:
Originally posted by Strikeslip:
Originally posted by fotomann_forever:
oh yeah, I'm gonna kick butt and take names :-) |
I'm gonna lick butt and take names. (I can't believe I just typed that.) |
And let me just say that this just gave me some serious shivers. |
baahahahaa! :-D
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12/14/2006 11:15:48 AM · #40 |
| I`m iiiiin!!!!! And I definitely will not kick anything... But I had fun doing it :P |
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12/14/2006 11:28:30 AM · #41 |
Originally posted by Gaby_G:
I`m iiiiin!!!!! And I definitely will not kick anything... But I had fun doing it :P |
How about lick? Seems to work for Slippy :P
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12/14/2006 11:28:45 AM · #42 |
| I'm in too. Won't be kicking too many butts on this one, methinks. but it should do OK. |
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12/14/2006 11:45:46 AM · #43 |
Originally posted by fotomann_forever:
Originally posted by Gaby_G:
I`m iiiiin!!!!! And I definitely will not kick anything... But I had fun doing it :P |
How about lick? Seems to work for Slippy :P |
Hmmm... licking doesnt work for me neither... |
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12/14/2006 12:00:50 PM · #44 |
been raining heavily here all week.... sigh....
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12/14/2006 01:00:19 PM · #45 |
I'm in. Is this a surprise to anyone? :-)
R.
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12/14/2006 01:03:22 PM · #46 |
Originally posted by Bear_Music:
I'm in. Is this a surprise to anyone? :-)
R. |
So, was the skiff in the original photo or was it added as part of a composite? ...:-P teehee
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12/14/2006 02:47:49 PM · #47 |
Originally posted by heathen:
Originally posted by Gaby_G:
Oh great... first experts challenge and I happen to live in one of the most poluted cities in the world... |
Certainly that can be used to your advantage, don't you think. Sunsets/sunrises must be rather interesting around there. |
Shanghai has some very interesting lighting at night, when the city lights hits the more than occasional smog ... but sunrise/sunset ... the sun cannot always be seen :-(
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12/14/2006 04:09:16 PM · #48 |
Originally posted by fotomann_forever:
Originally posted by Bear_Music:
I'm in. Is this a surprise to anyone? :-)
R. |
So, was the skiff in the original photo or was it added as part of a composite? ...:-P teehee |
We have entered a skiff-free zone until the spring thaw :-) I would not be so artificial as to insert an imagined skiff into winter's reality. What do you think I AM, anyway? jejeje�
R.
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12/14/2006 04:14:49 PM · #49 |
Originally posted by fotomann_forever:
Originally posted by Bear_Music:
I'm in. Is this a surprise to anyone? :-)
R. |
So, was the skiff in the original photo or was it added as part of a composite? ...:-P teehee |
I am thinking he'll do Nauset Light with a HUGE moon.
Bear have you ever done Nauset for a challange???
Long as fotomann isn't naked with a HUGE smile I can't wait to see the results.
Bear did you get that new 'puter yet?
Message edited by author 2006-12-14 16:15:24. |
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12/14/2006 06:10:18 PM · #50 |
Yipeee!! I'm in!! Wasn't planning on entering, but we had an amazing sky this morning.....
This was fun - I can't wait to see all the entries!! |
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